Any way to get a CSS vertical menu to load upwards rather than downwards?

CSS vertical menus display downwards. If the menu starts towards the bottom of the screen much of the menu (and sub menus) are hidden and scroll is needed to see them. But scrolling removes the hover and the drop down menu disappears. You can scroll by using the down direction key but this is not exactly user friendly. So I am thinking could the CSS menu rise up rather than drop down? Any one got any ideas...

Problem with this is that I guess you could get your first level drop down menu to display and just scroll it, but if you have long sub menus you are back with the same scrolling issue. So is there any way that drop downs will rise up?

It's always possible to have menus so long they will fall of the screen. That is probably a matter of structuring the menu in a different way. But I guess it is possible to have menus rise up. But then again, won't you get the same issue there?

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